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Abstract #2174

Flip angle modulation in single shot fast spin echo imaging greatly increases speed with little change in diagnostic image quality

Andreas M. Loening 1 , Manojkumar Saranathan 1 , Nichanan Ruangwattanapaisarn 2 , Daniel V. Litwiller 3 , Ann Shimakawa 3 , and Shreyas S. Vasanawala 1

1 Dept. of Radiology, Stanford University School of Medicine, Stanford, CA, United States, 2 Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand, 3 GE Healthcare Global MR Applications and Workflow, Rochester, MN, Menlo Park, CA, United States

Single shot fast spin echo acquisition speed is limited by specific absorption rate (SAR). Instead of using a constant low flip angle to reduce SAR, we modulated the refocusing flip angle over the course of the echo train and achieved an at least doubling of imaging speed (2-fold reduction in TR) while preserving image quality. This enabled abdominal scans with fewer, shorter breath-holds and better registered images.

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